US2669415A - Manually operated shutoff valve - Google Patents

Description

Feb. 16, 1954 J. GILROY 2,669,415

MANUALLY OPERATED SHUTOFF VALVE Filed Jan. 4, 1950 INVENTOR JOHN GILROY ATTORNEY 5 Patented Feb. 16, 1954 UNITED "S TATES tAQ'lEN'l" OFFICE MANUALLY OPERATED SHUTOFF VALVE John Gilroy, Sun Prairie, 'Wis., assigncr to Air Reduction Company; incorporated, New York,

N. Y., a corporation of New York Application January 4, 1950, Serial No. 136,154

This invention relates to valves and more particularly to a manually operated shut-oilvalve for controlling the flow of a fluid, such as gas, especially at low pressures.

The principal object of the invention is to provide a manually operated shut oii valve which is extremely simple in construction and inexpensive to manufacture and which is especially adapted for easy and qu'icl: insertion in a gas pipeline such for instance as a low pressure oxygen pipeline that supplies oxygen to 'a 3 Claims. (Cl. 251-45) respirator or breathing mask and when so inserted can be easily actuated by finger tip pressure to start or stop the flow of the oxygen or othergas. A valve embodying the invention is illustrated in the accompanying drawing, in which:

Figure 1 is a longitudinal section through the valve; and

Fig.2 is a top plan view of the valve, a portion of the actuating knob being broken away to 'show the manner in which it is connected to the 'valve stem.

The valve comprises a one-piece body portion it which is preferably a simple bar of any suitable metal having'its opposite ends threaded as shown at H and I2 and having a boss 13 intermediate its ends'and projecting transversely from the bar. The boss is externally threaded as shown at M. The body portion is drilledto proride a cavity is which extends axially through the boss i3 and transversely into the bar. This cavity may be of uniform diameter throughout but it preferably has the stepped'shape shown in Fig. 1, the upper portion oithe cavity that extends through the boss being larger in diameter than the lower portion of the cavity. The bar is also drilled longitudinally to provide a pair of gas passages l3 and I! each of which extends from an end face of the bar to the cavity it. The regions at which the inner ends of these gas passages communicate with the cavity K5 are in spaced relation along the length of the cavity, the passage It communicating with the smaller diameter portion of the cavity near the lower end thereof, and the passage il com municating with the larger diameter portion of the cavity. One of these passages is an inlet passage and the other is an outlet passage, the passage i5 preferably being the inlet passage and the passage I? the outlet passage.

A cylindrical valve stem is is sliclably guided in'the' larger diameter portion of the cavity 55 and is of such a diameter that'it can move freely in the cavity in an axial direction. The upper portion of the valve stem is provided with an encircling groove is in which is positioned an O-ring 20 which cooperates with the wall of the upper portion of the cavity to provide'a gas tight seal around the valve stem. This Owing therefore serves as a valve stem packing. The valve stem is has portion 2| of reduced diameter projecting from its lower end and which is adapted to enter the lower smaller diameter portion of the cavity 15 when the valve stem is moved downwardly from the position shown in lfig. 1. This portion of the valve stem is also provided with anencircling groove 22 in which is positioned a'second'O-ring 23 having anoverall diameter such that it can move laterallyinto the smaller diameter portion of the cavity 15 and then in cooperation with the wall of this portion of the cavity effect a gas-tight seal that prevents the flow of gas past it. The two o-ring's are preferably made of a resilient elastic composition such as described in the patent to Christensen No. 2,180,795. Neoprene o-rings have been found particularly serviceable when the valve is used in an oxygen pipeline.

A hollow knob or cap nut 24 is interiorly threaded as shown. at '25 and screws on the ex, ternally threaded boss I3. The valve stem 18 has a portion 2% which extends upwardly and freely into the interior of the hollow knob. A pin 2"! carried by the knob 24 passes transversely across the space within it (see also Fig. 2) and through an opening 28 in the portion 25 cf the valve stem. The opening 28 is an oversize opening so that the pin 2? passes through it witha small amount of play.

It will now be seen thatby screwing the knob 24 down on the boss 33 the valve stem :8 can he moved axially and downwardly to bring the tl ring 23 to the (lette .line position shown in Fig. 1 in which it makes contact with the wall the smaller diameter portion of the cavity [5 between the two regions where the inner ends of the passages 15 and i'i communicate with the cavity. This is the closed position of the valve in which the 0ring 23 prevents passage of gas from the inlet passage 16 to the outlet passage ll. When the knob 24 is turned in the opposite direction the valve stem It is moved axially upward to the full line position shown in Fig. l. The valve stem is prevented from being retracted out of the cavityby a snap ring 28 positioned in groove in the wall of the larger diameter portion of the cavity :5 near its upper end. The upperencl of the larger diameter portion of the valve stem abuts against 3 this snap ring when the valve is in the fully open position.

The larger diameter portion of the valve stem I8 is sufficiently long and has a sufliciently large diameter to prevent any substantial amount of tilting or cooking of the valve stem in the cavity in which it slides, thus assuring accurate guiding of the O-ring 23 and assuring its free passage into and out of the smaller diameter portion of the cavity I5. Moreover, the play provided in the connection 21-48 between the actuating knob and the valve stem prevents any jamming or binding of the parts or cooking of the O-ring 23 when the actuating knob is turned, thereby permitting the O-ring 23 to be completely self-aligning with respect to the smaller diameter portion of the cavity l5 into and out of which it moves, and also reducing wear on the parts to a minimum.

The actuating knob 24 and the threaded boss l3 are so proportioned that when the O-ring 23 has been brought to the dotted line position shown in Fig. l (the closed position of the valve) by screwing the knob down on the boss, the lower surface 30 of the knob comes in contact with a surface 3| on the body portion of the valve. When these surfaces are in contact forcible turning of the knob a small additional amount will lock the knob to some extent against easy manual turning in the opposite direction to open the valve. Therefore, if the knob is forcibly turned a small amount after the surfaces 30 and 3| are in contact by a tool, such as a Wrench, the valve can be sufficiently locked in closed position to make manual opening of it almost impossible until the knob is again turned by the tool to' loosen it, thus preventing tampering and unauthorized opening of the valve when this is desired. To facilitate the tool or Wrench turning of the knob it may be given a square exterior configuration or the hexagonal exterior configuration shown in Fig. 2 to provide at least one pair of oppositely disposed fiat side walls which can be gripped by the wrench or other tool. Any other suitable means to facilitate tool actuation of the knob 24 may be employed. It should be understood, however, that the forcible turning of the knob is only necessary to lock the valve in closed position to prevent tampering and that in normal operation the knob can be turned quite freely by finger tip pressure to open or close the .valve.

The forcible turning of the actuating knob '24 may be done without any risk of damage 'to the valve as the force exerted will not in any the gas flow perfectly with mere finger tip pressure.

It will be noted that when the O-ring 23 is in the full line position shown in Fig. 1 the valve has a large flow capacity because the O-ring is then in the larger diameter portion of the cavity 15 which has a diameter greater than the diameter of the O-ring and therefore the gas can flow freely past the -ring 23 all around its circumference from the inlet passage IE to the outlet passage H. Moreover, a smaller movement of the O-ring 23 from its closed to its open position is required to permit this large capacity flow than would be the case if the cavity l were of uniform diameter throughout and the O-ring 23 had to move completely above the entrance end In fact, the

of the outlet passage I! to permit unobstructed flow of the gas from the passage 16 into the passage The valve therefore has a relatively large flow capacity despite its compactness.

The valve has a number of functional, economic and manufacturing advantages over previous valves intended for similar service. The body portion may be easily and economically machined from a relatively small quantity of bar stock, it being only necessary to provide the boss on a piece of the bar stock and thread the ends of the bar and the boss and drill the several bores to form the valve and valve-stem cavity and the gas passages. The O- rings 20 and 23, snap ring 29, and pin 21 are all high production standard parts. Assembling of the parts is a simple mat ter and may be done rapidly. The threads at the opposite ends of the body portion enable the assembled valve to be easily and quickly inserted in a pipeline. Similar valves may be made without threaded ends for use with soldered joints or the like.

The valve has a long operating life and has been found to be extremely dependable. It is essentially a low pressure valve, having been found especially useful for line pressures up to 200 p. s. i. In laboratory tests of a number of standard valves most failed either by leakage past the valve element or by packing leakage in 3,000 to 30,000 operations. Valves of the type herein described were each operated 200,000 times without packing leakage or leakage past the valve element.

I claim:

1. A valve comprising a body portion having an externally threaded boss and having a cylindrical cavity extending axiall through the boss and into the body portion, the body portion also having an inlet gas passage leading to said cavity and an outlet gas passage leading from said cavity at a region spaced along the length of the cavity from the juncture thereof with the inlet gas passage, a valve stem slidably guided in a portion of said cavity and having a packing ring cooperating with the wall thereof to produce a gas-tight seal around the valve stem, a hollow internally threaded knob having threaded engagement with said boss, a portion of the valve stem projecting into the interior of the knob, said portion of the valve stem extending only partially into the knob and having such outer dimensions relative to the interior dimensions of said knob that substantial clearance is maintained at all points between said stem and said knob, a pin carried by the knob and extending transversely across the space within it, said portion of the valve stem having a circular opening extending through it, the diameter of which is substantially greater than the diameter of the pin, said pin freely passing through said opening whereby turning of the knob on the boss moves the valve stem longitudinally in said cavity without causing it to cock and bind, and a ring of resilient material carried by the valve stem and in one position of the valve stem making contact with the Wall of the cavity between the points of juncture therewith of the inlet and outlet gas passages to thereby shut off communication between said gas passages and in a different position of the valve stem placing the gas passages in communication with each other.

2. A valve comprising a body portion having an externally threaded. boss' projecting from it and having a cylindrical cavity extending axially through the boss into the body portion, the body portion further having gas passages leading to and from said cavity and communicating therewith at regions which are in spaced relation along the length of the cavity, a valve stem slidably guided in a portion of said cavity and having a packing ring cooperating With the wall thereof to produce a gas-tight seal around the valve stem, a ring of resilient material carried by the valve stem and in one position of the valve stem making contact with the wall of another portion of the cavity intermediate said regions at which the gas passages communicate with the cavity and thereby shutting off communication between the gas passages and in a different position of the valve stem placing the gas passages in communication wlth each other, an internally threaded cap nut having threaded engagement with said boss, a portion of the valve stem projecting into the interior of said cap nut, said portion of the valve stem extending only partially into the cap and having such outer dimensions relative to the interior dimensions of said cap that substantial clearance is maintained at all points between said stem and said cap, a loose connection between the cap nut and said portion of the valve stem producing longitudinal movement of the valve stem when the cap nut is turned on the boss, said connection having substantial play permitting substantial relative movement or" the cap nut and the valve stem in all directions which prevents cooking and binding of the valve stem when it is so moved by the cap nut, and the cap nut and the body portion having surfaces adapted to be brought into firm contact by a forcible turning of the cap nut on said boss without a consequent increase in pressure upon said ring of resilient material.

3. A valve comprising a body portion having an externally threaded boss projecting from it and having a cylindrical cavity extending axially through the boss into the bod portion, one portion of said cavity being of larger diameter than the adjacent portion, the body portion further having a pair of gas passages one of which communicates with the larger diameter portion of said cavity and the other of which communicates with the smaller diameter portion of the cavity, a valve stem guided by and movable longitudinally in the larger diameter portion of the cavity and having a part arranged to be moved into and out of the smaller diameter portion of the cavity when the valve stem is moved longitudinally, an 0-ring carried by said part of the valve stem and also adapted to be moved into and out of the smaller diameter portion of the cavity when the valve stem is moved longitudinally so that when it is in the smaller diameter portion of the cavity it shuts off communication between said gas pas sage and when it is in the larger diameter portion of the cavity it permits gas to flow past it all around its circumference and from one gas passage to the other, an internally threaded cap nut having threaded engagement with said boss, a portion or the valve stem projecting into the interior of said cap nut, said portion of the valve stem extending only partially into the cap and having such outer dimensions relative to the interior dimensions of said cap that substantial clearance is maintained at all points between said stem and said cap, a pin carried by the cap nut and extending transversely across the space within it, said portion. of the valve stem having a circular opening extending through it, the diameter of which is substantially greater than the diameter or" the pin, said pin freely passing through said opening whereby turning of the cap nut on the boss moves the valve stem longitudinally in said cavity without causing it to cook and bind, the cap nut and the body portion having surfaces adapted to be brought into firm contact by a forcible turn of the cap nut on said boss without any consequent increase in pressure on said O-ring.

JOHN GILROY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 263,991 Ashton Aug. 22, 1882 85%,134 Whitaker May 21, 1907 995,247 Garratt Jan. 13, 1911 1,016,306 Vial Feb. 6, 1912 1,779,740 Kehl Oct. 28, 1930 1,886,159 Brown Nov. 1, 1932 2,126,594 Weatherhead Aug. 9, 1938 17,835 Corbin Oct. 15, 1940 2,360,733 Smith Oct. 17, 1944 2,417,242 E'ckel Mar. 11, 1947 2,431, 137 Van Der Werff Nov. 25, 1947 2,525,928 McRae Oct. 17, 1950 FOREIGN PATENTS Number Country Date 9,164 Great Britain of 1915 272,665 Switzerland of 1951

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